| 1 | /* |
| 2 | * vhost-net support |
| 3 | * |
| 4 | * Copyright Red Hat, Inc. 2010 |
| 5 | * |
| 6 | * Authors: |
| 7 | * Michael S. Tsirkin <mst@redhat.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 10 | * the COPYING file in the top-level directory. |
| 11 | * |
| 12 | * Contributions after 2012-01-13 are licensed under the terms of the |
| 13 | * GNU GPL, version 2 or (at your option) any later version. |
| 14 | */ |
| 15 | |
| 16 | #include "qemu/osdep.h" |
| 17 | #include "net/net.h" |
| 18 | #include "net/tap.h" |
| 19 | #include "net/vhost-vdpa.h" |
| 20 | |
| 21 | #include "standard-headers/linux/vhost_types.h" |
| 22 | #include "hw/virtio/virtio-net.h" |
| 23 | #include "net/vhost_net.h" |
| 24 | #include "qapi/error.h" |
| 25 | #include "qemu/error-report.h" |
| 26 | #include "qemu/main-loop.h" |
| 27 | |
| 28 | #include <sys/socket.h> |
| 29 | #include <net/if.h> |
| 30 | #include <netinet/in.h> |
| 31 | |
| 32 | |
| 33 | #include "standard-headers/linux/virtio_ring.h" |
| 34 | #include "hw/virtio/vhost.h" |
| 35 | #include "hw/virtio/virtio-bus.h" |
| 36 | #include "linux-headers/linux/vhost.h" |
| 37 | |
| 38 | void vhost_net_get_features_ex(struct vhost_net *net, uint64_t *features) |
| 39 | { |
| 40 | vhost_get_features_ex(&net->dev, net->feature_bits, features); |
| 41 | } |
| 42 | int vhost_net_get_config(struct vhost_net *net, uint8_t *config, |
| 43 | uint32_t config_len) |
| 44 | { |
| 45 | return vhost_dev_get_config(&net->dev, config, config_len, NULL); |
| 46 | } |
| 47 | int vhost_net_set_config(struct vhost_net *net, const uint8_t *data, |
| 48 | uint32_t offset, uint32_t size, uint32_t flags) |
| 49 | { |
| 50 | return vhost_dev_set_config(&net->dev, data, offset, size, flags); |
| 51 | } |
| 52 | |
| 53 | void vhost_net_ack_features_ex(struct vhost_net *net, const uint64_t *features) |
| 54 | { |
| 55 | virtio_features_clear(net->dev.acked_features_ex); |
| 56 | if (net->backend == -1) { |
| 57 | net->dev.acked_features = (vhost_dev_features(&net->dev) & |
| 58 | (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)); |
| 59 | } else if (!qemu_has_vnet_hdr(net->nc)) { |
| 60 | net->dev.acked_features = 1ULL << VHOST_NET_F_VIRTIO_NET_HDR; |
| 61 | } |
| 62 | |
| 63 | vhost_ack_features_ex(&net->dev, net->feature_bits, features); |
| 64 | } |
| 65 | |
| 66 | uint64_t vhost_net_get_max_queues(VHostNetState *net) |
| 67 | { |
| 68 | return net->dev.max_queues; |
| 69 | } |
| 70 | |
| 71 | void vhost_net_get_acked_features_ex(VHostNetState *net, uint64_t *features) |
| 72 | { |
| 73 | virtio_features_copy(features, net->dev.acked_features_ex); |
| 74 | } |
| 75 | |
| 76 | void vhost_net_save_acked_features(NetClientState *nc) |
| 77 | { |
| 78 | struct vhost_net *net = get_vhost_net(nc); |
| 79 | |
| 80 | if (net && net->save_acked_features) { |
| 81 | net->save_acked_features(nc); |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | static void vhost_net_disable_notifiers_nvhosts(VirtIODevice *dev, |
| 86 | NetClientState *ncs, int data_queue_pairs, int nvhosts) |
| 87 | { |
| 88 | VirtIONet *n = VIRTIO_NET(dev); |
| 89 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev))); |
| 90 | struct vhost_net *net; |
| 91 | struct vhost_dev *hdev; |
| 92 | int r, i, j; |
| 93 | NetClientState *peer; |
| 94 | |
| 95 | /* |
| 96 | * Batch all the host notifiers in a single transaction to avoid |
| 97 | * quadratic time complexity in address_space_update_ioeventfds(). |
| 98 | */ |
| 99 | memory_region_transaction_begin(); |
| 100 | |
| 101 | for (i = 0; i < nvhosts; i++) { |
| 102 | if (i < data_queue_pairs) { |
| 103 | peer = qemu_get_peer(ncs, i); |
| 104 | } else { |
| 105 | peer = qemu_get_peer(ncs, n->max_queue_pairs); |
| 106 | } |
| 107 | |
| 108 | net = get_vhost_net(peer); |
| 109 | hdev = &net->dev; |
| 110 | for (j = 0; j < hdev->nvqs; j++) { |
| 111 | r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), |
| 112 | hdev->vq_index + j, |
| 113 | false); |
| 114 | if (r < 0) { |
| 115 | error_report("vhost %d VQ %d notifier cleanup failed: %d", |
| 116 | i, j, -r); |
| 117 | } |
| 118 | assert(r >= 0); |
| 119 | } |
| 120 | } |
| 121 | /* |
| 122 | * The transaction expects the ioeventfds to be open when it |
| 123 | * commits. Do it now, before the cleanup loop. |
| 124 | */ |
| 125 | memory_region_transaction_commit(); |
| 126 | |
| 127 | for (i = 0; i < nvhosts; i++) { |
| 128 | if (i < data_queue_pairs) { |
| 129 | peer = qemu_get_peer(ncs, i); |
| 130 | } else { |
| 131 | peer = qemu_get_peer(ncs, n->max_queue_pairs); |
| 132 | } |
| 133 | |
| 134 | net = get_vhost_net(peer); |
| 135 | hdev = &net->dev; |
| 136 | for (j = 0; j < hdev->nvqs; j++) { |
| 137 | virtio_bus_cleanup_host_notifier(VIRTIO_BUS(qbus), |
| 138 | hdev->vq_index + j); |
| 139 | } |
| 140 | virtio_device_release_ioeventfd(dev); |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | static int vhost_net_enable_notifiers(VirtIODevice *dev, |
| 145 | NetClientState *ncs, int data_queue_pairs, int cvq) |
| 146 | { |
| 147 | VirtIONet *n = VIRTIO_NET(dev); |
| 148 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev))); |
| 149 | int nvhosts = data_queue_pairs + cvq; |
| 150 | struct vhost_net *net; |
| 151 | struct vhost_dev *hdev; |
| 152 | int r, i, j, k; |
| 153 | NetClientState *peer; |
| 154 | |
| 155 | /* |
| 156 | * We will pass the notifiers to the kernel, make sure that QEMU |
| 157 | * doesn't interfere. |
| 158 | */ |
| 159 | for (i = 0; i < nvhosts; i++) { |
| 160 | r = virtio_device_grab_ioeventfd(dev); |
| 161 | if (r < 0) { |
| 162 | error_report("vhost %d binding does not support host notifiers", i); |
| 163 | for (k = 0; k < i; k++) { |
| 164 | virtio_device_release_ioeventfd(dev); |
| 165 | } |
| 166 | return r; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | /* |
| 171 | * Batch all the host notifiers in a single transaction to avoid |
| 172 | * quadratic time complexity in address_space_update_ioeventfds(). |
| 173 | */ |
| 174 | memory_region_transaction_begin(); |
| 175 | |
| 176 | for (i = 0; i < nvhosts; i++) { |
| 177 | if (i < data_queue_pairs) { |
| 178 | peer = qemu_get_peer(ncs, i); |
| 179 | } else { |
| 180 | peer = qemu_get_peer(ncs, n->max_queue_pairs); |
| 181 | } |
| 182 | |
| 183 | net = get_vhost_net(peer); |
| 184 | hdev = &net->dev; |
| 185 | |
| 186 | for (j = 0; j < hdev->nvqs; j++) { |
| 187 | r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), |
| 188 | hdev->vq_index + j, |
| 189 | true); |
| 190 | if (r < 0) { |
| 191 | error_report("vhost %d VQ %d notifier binding failed: %d", |
| 192 | i, j, -r); |
| 193 | memory_region_transaction_commit(); |
| 194 | vhost_dev_disable_notifiers_nvqs(hdev, dev, j); |
| 195 | goto fail_nvhosts; |
| 196 | } |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | memory_region_transaction_commit(); |
| 201 | |
| 202 | return 0; |
| 203 | fail_nvhosts: |
| 204 | vhost_net_disable_notifiers_nvhosts(dev, ncs, data_queue_pairs, i); |
| 205 | /* |
| 206 | * This for loop starts from i+1, not i, because the i-th ioeventfd |
| 207 | * has already been released in vhost_dev_disable_notifiers_nvqs(). |
| 208 | */ |
| 209 | for (k = i + 1; k < nvhosts; k++) { |
| 210 | virtio_device_release_ioeventfd(dev); |
| 211 | } |
| 212 | |
| 213 | return r; |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Stop processing guest IO notifications in qemu. |
| 218 | * Start processing them in vhost in kernel. |
| 219 | */ |
| 220 | static void vhost_net_disable_notifiers(VirtIODevice *dev, |
| 221 | NetClientState *ncs, int data_queue_pairs, int cvq) |
| 222 | { |
| 223 | vhost_net_disable_notifiers_nvhosts(dev, ncs, data_queue_pairs, |
| 224 | data_queue_pairs + cvq); |
| 225 | } |
| 226 | |
| 227 | static int vhost_net_get_fd(NetClientState *backend) |
| 228 | { |
| 229 | switch (backend->info->type) { |
| 230 | case NET_CLIENT_DRIVER_TAP: |
| 231 | return tap_get_fd(backend); |
| 232 | default: |
| 233 | fprintf(stderr, "vhost-net requires tap backend\n"); |
| 234 | return -ENOSYS; |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | struct vhost_net *vhost_net_init(VhostNetOptions *options) |
| 239 | { |
| 240 | int r; |
| 241 | bool backend_kernel = options->backend_type == VHOST_BACKEND_TYPE_KERNEL; |
| 242 | struct vhost_net *net = g_new0(struct vhost_net, 1); |
| 243 | uint64_t missing_features[VIRTIO_FEATURES_NU64S]; |
| 244 | uint64_t features[VIRTIO_FEATURES_NU64S]; |
| 245 | Error *local_err = NULL; |
| 246 | |
| 247 | if (!options->net_backend) { |
| 248 | fprintf(stderr, "vhost-net requires net backend to be setup\n"); |
| 249 | goto fail; |
| 250 | } |
| 251 | net->nc = options->net_backend; |
| 252 | net->dev.nvqs = options->nvqs; |
| 253 | net->feature_bits = options->feature_bits; |
| 254 | net->save_acked_features = options->save_acked_features; |
| 255 | net->max_tx_queue_size = options->max_tx_queue_size; |
| 256 | net->is_vhost_user = options->is_vhost_user; |
| 257 | virtio_features_clear(features); |
| 258 | |
| 259 | net->dev.max_queues = 1; |
| 260 | net->dev.vqs = net->vqs; |
| 261 | |
| 262 | if (backend_kernel) { |
| 263 | r = vhost_net_get_fd(options->net_backend); |
| 264 | if (r < 0) { |
| 265 | goto fail; |
| 266 | } |
| 267 | net->backend = r; |
| 268 | } else { |
| 269 | net->backend = -1; |
| 270 | |
| 271 | /* vhost-user needs vq_index to initiate a specific queue pair */ |
| 272 | net->dev.vq_index = net->nc->queue_index * net->dev.nvqs; |
| 273 | } |
| 274 | |
| 275 | r = vhost_dev_init(&net->dev, options->opaque, |
| 276 | options->backend_type, options->busyloop_timeout, |
| 277 | &local_err); |
| 278 | if (r < 0) { |
| 279 | error_report_err(local_err); |
| 280 | goto fail; |
| 281 | } |
| 282 | if (backend_kernel) { |
| 283 | if (!qemu_has_vnet_hdr_len(options->net_backend, |
| 284 | sizeof(struct virtio_net_hdr_mrg_rxbuf))) { |
| 285 | vhost_dev_clear_feature(&net->dev, VIRTIO_NET_F_MRG_RXBUF); |
| 286 | } |
| 287 | |
| 288 | if (!qemu_has_vnet_hdr(options->net_backend) && |
| 289 | !vhost_dev_has_feature(&net->dev, VHOST_NET_F_VIRTIO_NET_HDR)) { |
| 290 | fprintf(stderr, "vhost lacks VHOST_NET_F_VIRTIO_NET_HDR " |
| 291 | "feature for backend\n"); |
| 292 | goto fail; |
| 293 | } |
| 294 | } |
| 295 | |
| 296 | /* Set sane init value. Override when guest acks. */ |
| 297 | if (options->get_acked_features) { |
| 298 | virtio_features_from_u64(features, |
| 299 | options->get_acked_features(net->nc)); |
| 300 | if (virtio_features_andnot(missing_features, features, |
| 301 | vhost_dev_features_ex(&net->dev))) { |
| 302 | fprintf(stderr, "vhost lacks feature mask 0x" VIRTIO_FEATURES_FMT |
| 303 | " for backend\n", VIRTIO_FEATURES_PR(missing_features)); |
| 304 | goto fail; |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | vhost_net_ack_features_ex(net, features); |
| 309 | |
| 310 | return net; |
| 311 | |
| 312 | fail: |
| 313 | vhost_dev_cleanup(&net->dev); |
| 314 | g_free(net); |
| 315 | return NULL; |
| 316 | } |
| 317 | |
| 318 | static void vhost_net_set_vq_index(struct vhost_net *net, int vq_index, |
| 319 | int vq_index_end) |
| 320 | { |
| 321 | net->dev.vq_index = vq_index; |
| 322 | net->dev.vq_index_end = vq_index_end; |
| 323 | } |
| 324 | |
| 325 | static int vhost_net_start_one(struct vhost_net *net, |
| 326 | VirtIODevice *dev) |
| 327 | { |
| 328 | struct vhost_vring_file file = { }; |
| 329 | int r; |
| 330 | |
| 331 | if (net->nc->info->start) { |
| 332 | r = net->nc->info->start(net->nc); |
| 333 | if (r < 0) { |
| 334 | return r; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | r = vhost_dev_start(&net->dev, dev, false); |
| 339 | if (r < 0) { |
| 340 | goto fail_start; |
| 341 | } |
| 342 | |
| 343 | if (net->nc->info->poll) { |
| 344 | net->nc->info->poll(net->nc, false); |
| 345 | } |
| 346 | |
| 347 | if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) { |
| 348 | qemu_set_fd_handler(net->backend, NULL, NULL, NULL); |
| 349 | file.fd = net->backend; |
| 350 | for (file.index = 0; file.index < net->dev.nvqs; ++file.index) { |
| 351 | if (!virtio_queue_enabled(dev, net->dev.vq_index + |
| 352 | file.index)) { |
| 353 | /* Queue might not be ready for start */ |
| 354 | continue; |
| 355 | } |
| 356 | r = vhost_net_set_backend(&net->dev, &file); |
| 357 | if (r < 0) { |
| 358 | r = -errno; |
| 359 | goto fail; |
| 360 | } |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | if (net->nc->info->load) { |
| 365 | r = net->nc->info->load(net->nc); |
| 366 | if (r < 0) { |
| 367 | goto fail; |
| 368 | } |
| 369 | } |
| 370 | return 0; |
| 371 | fail: |
| 372 | file.fd = -1; |
| 373 | if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) { |
| 374 | while (file.index-- > 0) { |
| 375 | if (!virtio_queue_enabled(dev, net->dev.vq_index + |
| 376 | file.index)) { |
| 377 | /* Queue might not be ready for start */ |
| 378 | continue; |
| 379 | } |
| 380 | int ret = vhost_net_set_backend(&net->dev, &file); |
| 381 | assert(ret >= 0); |
| 382 | } |
| 383 | } |
| 384 | if (net->nc->info->poll) { |
| 385 | net->nc->info->poll(net->nc, true); |
| 386 | } |
| 387 | vhost_dev_stop(&net->dev, dev, false); |
| 388 | fail_start: |
| 389 | return r; |
| 390 | } |
| 391 | |
| 392 | static void vhost_net_stop_one(struct vhost_net *net, |
| 393 | VirtIODevice *dev) |
| 394 | { |
| 395 | struct vhost_vring_file file = { .fd = -1 }; |
| 396 | |
| 397 | if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) { |
| 398 | for (file.index = 0; file.index < net->dev.nvqs; ++file.index) { |
| 399 | int r = vhost_net_set_backend(&net->dev, &file); |
| 400 | assert(r >= 0); |
| 401 | } |
| 402 | } |
| 403 | if (net->nc->info->poll) { |
| 404 | net->nc->info->poll(net->nc, true); |
| 405 | } |
| 406 | vhost_dev_stop(&net->dev, dev, false); |
| 407 | if (net->nc->info->stop) { |
| 408 | net->nc->info->stop(net->nc); |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | int vhost_net_start(VirtIODevice *dev, NetClientState *ncs, |
| 413 | int data_queue_pairs, int cvq) |
| 414 | { |
| 415 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev))); |
| 416 | VirtioBusState *vbus = VIRTIO_BUS(qbus); |
| 417 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); |
| 418 | int total_notifiers = data_queue_pairs * 2 + cvq; |
| 419 | VirtIONet *n = VIRTIO_NET(dev); |
| 420 | int nvhosts = data_queue_pairs + cvq; |
| 421 | struct vhost_net *net; |
| 422 | int r, e, i, index_end = data_queue_pairs * 2; |
| 423 | NetClientState *peer; |
| 424 | |
| 425 | if (cvq) { |
| 426 | index_end += 1; |
| 427 | } |
| 428 | |
| 429 | if (!k->set_guest_notifiers) { |
| 430 | error_report("binding does not support guest notifiers"); |
| 431 | return -ENOSYS; |
| 432 | } |
| 433 | |
| 434 | for (i = 0; i < nvhosts; i++) { |
| 435 | |
| 436 | if (i < data_queue_pairs) { |
| 437 | peer = qemu_get_peer(ncs, i); |
| 438 | } else { /* Control Virtqueue */ |
| 439 | peer = qemu_get_peer(ncs, n->max_queue_pairs); |
| 440 | } |
| 441 | |
| 442 | net = get_vhost_net(peer); |
| 443 | vhost_net_set_vq_index(net, i * 2, index_end); |
| 444 | |
| 445 | /* Suppress the masking guest notifiers on vhost user |
| 446 | * because vhost user doesn't interrupt masking/unmasking |
| 447 | * properly. |
| 448 | */ |
| 449 | if (net->is_vhost_user) { |
| 450 | dev->use_guest_notifier_mask = false; |
| 451 | } |
| 452 | } |
| 453 | |
| 454 | r = vhost_net_enable_notifiers(dev, ncs, data_queue_pairs, cvq); |
| 455 | if (r < 0) { |
| 456 | error_report("Error enabling host notifiers: %d", -r); |
| 457 | goto err; |
| 458 | } |
| 459 | |
| 460 | r = k->set_guest_notifiers(qbus->parent, total_notifiers, true); |
| 461 | if (r < 0) { |
| 462 | error_report("Error binding guest notifier: %d", -r); |
| 463 | goto err_host_notifiers; |
| 464 | } |
| 465 | |
| 466 | for (i = 0; i < nvhosts; i++) { |
| 467 | if (i < data_queue_pairs) { |
| 468 | peer = qemu_get_peer(ncs, i); |
| 469 | } else { |
| 470 | peer = qemu_get_peer(ncs, n->max_queue_pairs); |
| 471 | } |
| 472 | |
| 473 | if (peer->vring_enable) { |
| 474 | /* restore vring enable state */ |
| 475 | r = vhost_net_set_vring_enable(peer, peer->vring_enable); |
| 476 | |
| 477 | if (r < 0) { |
| 478 | goto err_guest_notifiers; |
| 479 | } |
| 480 | } |
| 481 | |
| 482 | r = vhost_net_start_one(get_vhost_net(peer), dev); |
| 483 | if (r < 0) { |
| 484 | goto err_guest_notifiers; |
| 485 | } |
| 486 | } |
| 487 | |
| 488 | return 0; |
| 489 | |
| 490 | err_guest_notifiers: |
| 491 | while (--i >= 0) { |
| 492 | peer = qemu_get_peer(ncs, i < data_queue_pairs ? |
| 493 | i : n->max_queue_pairs); |
| 494 | vhost_net_stop_one(get_vhost_net(peer), dev); |
| 495 | } |
| 496 | e = k->set_guest_notifiers(qbus->parent, total_notifiers, false); |
| 497 | if (e < 0) { |
| 498 | fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e); |
| 499 | fflush(stderr); |
| 500 | } |
| 501 | err_host_notifiers: |
| 502 | vhost_net_disable_notifiers(dev, ncs, data_queue_pairs, cvq); |
| 503 | err: |
| 504 | return r; |
| 505 | } |
| 506 | |
| 507 | void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs, |
| 508 | int data_queue_pairs, int cvq) |
| 509 | { |
| 510 | BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev))); |
| 511 | VirtioBusState *vbus = VIRTIO_BUS(qbus); |
| 512 | VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); |
| 513 | VirtIONet *n = VIRTIO_NET(dev); |
| 514 | NetClientState *peer; |
| 515 | int total_notifiers = data_queue_pairs * 2 + cvq; |
| 516 | int nvhosts = data_queue_pairs + cvq; |
| 517 | int i, r; |
| 518 | |
| 519 | for (i = 0; i < nvhosts; i++) { |
| 520 | if (i < data_queue_pairs) { |
| 521 | peer = qemu_get_peer(ncs, i); |
| 522 | } else { |
| 523 | peer = qemu_get_peer(ncs, n->max_queue_pairs); |
| 524 | } |
| 525 | vhost_net_stop_one(get_vhost_net(peer), dev); |
| 526 | } |
| 527 | |
| 528 | r = k->set_guest_notifiers(qbus->parent, total_notifiers, false); |
| 529 | if (r < 0) { |
| 530 | fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r); |
| 531 | fflush(stderr); |
| 532 | } |
| 533 | assert(r >= 0); |
| 534 | |
| 535 | vhost_net_disable_notifiers(dev, ncs, data_queue_pairs, cvq); |
| 536 | } |
| 537 | |
| 538 | void vhost_net_cleanup(struct vhost_net *net) |
| 539 | { |
| 540 | vhost_dev_cleanup(&net->dev); |
| 541 | } |
| 542 | |
| 543 | int vhost_net_notify_migration_done(struct vhost_net *net, char* mac_addr) |
| 544 | { |
| 545 | const VhostOps *vhost_ops = net->dev.vhost_ops; |
| 546 | |
| 547 | assert(vhost_ops->backend_type == VHOST_BACKEND_TYPE_USER); |
| 548 | assert(vhost_ops->vhost_migration_done); |
| 549 | |
| 550 | return vhost_ops->vhost_migration_done(&net->dev, mac_addr); |
| 551 | } |
| 552 | |
| 553 | bool vhost_net_virtqueue_pending(VHostNetState *net, int idx) |
| 554 | { |
| 555 | return vhost_virtqueue_pending(&net->dev, idx); |
| 556 | } |
| 557 | |
| 558 | void vhost_net_virtqueue_mask(VHostNetState *net, VirtIODevice *dev, |
| 559 | int idx, bool mask) |
| 560 | { |
| 561 | vhost_virtqueue_mask(&net->dev, dev, idx, mask); |
| 562 | } |
| 563 | |
| 564 | bool vhost_net_config_pending(VHostNetState *net) |
| 565 | { |
| 566 | return vhost_config_pending(&net->dev); |
| 567 | } |
| 568 | |
| 569 | void vhost_net_config_mask(VHostNetState *net, VirtIODevice *dev, bool mask) |
| 570 | { |
| 571 | vhost_config_mask(&net->dev, dev, mask); |
| 572 | } |
| 573 | |
| 574 | VHostNetState *get_vhost_net(NetClientState *nc) |
| 575 | { |
| 576 | if (!nc) { |
| 577 | return 0; |
| 578 | } |
| 579 | |
| 580 | if (nc->info->get_vhost_net) { |
| 581 | return nc->info->get_vhost_net(nc); |
| 582 | } |
| 583 | |
| 584 | return NULL; |
| 585 | } |
| 586 | |
| 587 | int vhost_net_set_vring_enable(NetClientState *nc, int enable) |
| 588 | { |
| 589 | VHostNetState *net = get_vhost_net(nc); |
| 590 | |
| 591 | /* |
| 592 | * vhost-vdpa network devices need to enable dataplane virtqueues after |
| 593 | * DRIVER_OK, so they can recover device state before starting dataplane. |
| 594 | * Because of that, we don't enable virtqueues here and leave it to |
| 595 | * net/vhost-vdpa.c. |
| 596 | */ |
| 597 | if (nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA) { |
| 598 | return 0; |
| 599 | } |
| 600 | |
| 601 | nc->vring_enable = enable; |
| 602 | |
| 603 | return vhost_dev_set_vring_enable(&net->dev, enable); |
| 604 | } |
| 605 | |
| 606 | int vhost_net_set_mtu(struct vhost_net *net, uint16_t mtu) |
| 607 | { |
| 608 | const VhostOps *vhost_ops = net->dev.vhost_ops; |
| 609 | |
| 610 | if (!vhost_ops->vhost_net_set_mtu) { |
| 611 | return 0; |
| 612 | } |
| 613 | |
| 614 | return vhost_ops->vhost_net_set_mtu(&net->dev, mtu); |
| 615 | } |
| 616 | |
| 617 | void vhost_net_virtqueue_reset(VirtIODevice *vdev, NetClientState *nc, |
| 618 | int vq_index) |
| 619 | { |
| 620 | VHostNetState *net = get_vhost_net(nc->peer); |
| 621 | const VhostOps *vhost_ops = net->dev.vhost_ops; |
| 622 | struct vhost_vring_file file = { .fd = -1 }; |
| 623 | int idx; |
| 624 | |
| 625 | /* should only be called after backend is connected */ |
| 626 | assert(vhost_ops); |
| 627 | |
| 628 | idx = vhost_ops->vhost_get_vq_index(&net->dev, vq_index); |
| 629 | |
| 630 | if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) { |
| 631 | file.index = idx; |
| 632 | int r = vhost_net_set_backend(&net->dev, &file); |
| 633 | assert(r >= 0); |
| 634 | } |
| 635 | |
| 636 | vhost_virtqueue_stop(&net->dev, |
| 637 | vdev, |
| 638 | net->dev.vqs + idx, |
| 639 | net->dev.vq_index + idx); |
| 640 | } |
| 641 | |
| 642 | int vhost_net_virtqueue_restart(VirtIODevice *vdev, NetClientState *nc, |
| 643 | int vq_index) |
| 644 | { |
| 645 | VHostNetState *net = get_vhost_net(nc->peer); |
| 646 | const VhostOps *vhost_ops = net->dev.vhost_ops; |
| 647 | struct vhost_vring_file file = { }; |
| 648 | int idx, r; |
| 649 | |
| 650 | if (!net->dev.started) { |
| 651 | return -EBUSY; |
| 652 | } |
| 653 | |
| 654 | /* should only be called after backend is connected */ |
| 655 | assert(vhost_ops); |
| 656 | |
| 657 | idx = vhost_ops->vhost_get_vq_index(&net->dev, vq_index); |
| 658 | |
| 659 | r = vhost_virtqueue_start(&net->dev, |
| 660 | vdev, |
| 661 | net->dev.vqs + idx, |
| 662 | net->dev.vq_index + idx); |
| 663 | if (r < 0) { |
| 664 | goto err_start; |
| 665 | } |
| 666 | |
| 667 | if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) { |
| 668 | file.index = idx; |
| 669 | file.fd = net->backend; |
| 670 | r = vhost_net_set_backend(&net->dev, &file); |
| 671 | if (r < 0) { |
| 672 | r = -errno; |
| 673 | goto err_start; |
| 674 | } |
| 675 | } |
| 676 | |
| 677 | return 0; |
| 678 | |
| 679 | err_start: |
| 680 | error_report("Error when restarting the queue."); |
| 681 | |
| 682 | if (net->nc->info->type == NET_CLIENT_DRIVER_TAP) { |
| 683 | file.fd = VHOST_FILE_UNBIND; |
| 684 | file.index = idx; |
| 685 | int ret = vhost_net_set_backend(&net->dev, &file); |
| 686 | assert(ret >= 0); |
| 687 | } |
| 688 | |
| 689 | vhost_dev_stop(&net->dev, vdev, false); |
| 690 | |
| 691 | return r; |
| 692 | } |